Crushing-mill



(No Model.) 2 Sheets-Sheet l.

G. W. MORROW.

GRUS'HING MILL.

2 Shee-ts-Sheet 2.

Patented Alun-1.5, 1884.

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W 0 Dn Du 0 M W G. M M ,Nw

GRUSEING MILL.

- Fig. l..

lhvrrnn Stearns GEORGE XV. MORROYV, OF TORONTO, OHIO,

CaUsHlNe-MILL.

SSPECIFICATION forming part of Letters Patent No. 297,083, dated April l5, 188%.

Application filed August 23, 1883.

,To all wtom t may concern:

Be it known that I, GEORGE W. Monnow, of Toronto, in the county of Jefferson and State of Ohio, have invented a new and useful linprovementin Crushing-Mills; and Ido hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to machines for grinding or crushing fire-clay, quartz, grain, cottonseed, and other materials, and has reference to that class of crushing-mills in which the material is fed upon a pan and crushed by means of heavy rolls working over the surface of said pan, either the rolls traveling around over a stationary pan or the pan being movable and traveling under the rolls, which are mounted on one or more shafts fitting in stationary bearings. It has special reference to mills of this class in which an' annular tapering pan and conical crushing-rolls are employed, the rolls and pan being constructed in this manner to overcomethe friction, as the outer ends oft-he rolls travel over morespace than the inner ends, and when made conical they do not drag over the face of the table, and for this reason they are not so liable to wear unevenly as where the rolls are not conical.

The special objects of my invention are to improve the discharge from these crushingniills, to lessen the force necessary to work them, and to cause them to wear longer.

To enable others skilled in the artto make' and use my invention, Iwill describe its construction and operation, referring to the accompanying drawings, in which- Figure l is a vertical section of a crushingmill, partly in full lines, embodying said invention. Fig. 2 is a section on the line 00 w, Fig. 3. Fig. 3 is aplan view, the upper part of the frame being removed, onthe line y y, Fig. 4 is a perspectivepview of the scraper; and Fig. 5 is a detached View of part of the skirt, to illustrate the means of adjustment.

Like letters of reference indicate like parts in each.

In the drawings, A represents the framework of the crushing -mill; c, the upright stanchions, and a the cross-beam.

The apparatus is illustrated where the table B is mounted so as to be rotated under the (No model.)

rolls C, and the shafts c ofthe rolls are mounted in stationary bearings c. The table is rigidly secured to the upright shaft b, which is journaled at the base in thc ink-pot b', and passes through the cross-beam a', and above the crossbeam is provided with the bevel cog-wheel d, in which the bevel-pinion d meshes, and the table is rotated by any suitable power applied through the bevel-gear. The table is formed of cast metal, and slopes gradually downward from the central shaft to the outer edge, being thus formed annularly tapering, to conform to the shape of the rolls, as hereinafter referred to, as well as to feed the material down under the crushing-rolls, and discharge the crushed material more easily from the table. The table is provided with suitable braces b2, extending out from the central hub, to give it the necessary strength, and is preferably provided with the -interchangeable segmental wearing-plates e, fitting in seats in the outer part of the table under the course ofthe crushing-rolls, these plates being formed on the same curve or taper as the face of the table. The wearing-plates c may be formed of very hard cast-steel or other met-al, while the body of the table may be formed of tougher and stronger metal than where it has to take the wear; and for this reason a more durable table is obtained, both Vagainst heavy strains and the wear in crushing. 4

Around the table, secured to the stauchions c and other suitable part of the frame, is the annular box f, into which the material is discharged from the table, the box having an inner rim, f', which iits up close to the braces b2 of the table, and an outer rim, g, which eX- tends up above the discharge-opening of the table, and at top of which is the flange g. To this outer rim, y, is secured the annular skirt h, which extends inwardly from the rim, so that its lower edge approaches the table and thus forms the annular discharge-opening for the crushed material at the edge of the table. IThe skirt h is vertically adjustable on the rim g of the box f, so that by raising or lowering the skirt the discharge-opening may be increased or diminished, according to the gage of the material to be crushed or in case the skirt or table should wear. In the drawings, the skirtis bolted to the rim g, through slots 7c in the rim, and may be adjusted by loosenheld in position thereon by the collars p.

ing the nuts and sliding the bolts in these slots; but other suitable means for adjusting the skirtmay be employed. The box f is provided with a discharge-spout, Z, and blades m, secured to the braces of the table, travel in the annular box, and carry the crushed material around in the box to the discharge-spout. The rolls C are conical in shape, their faces being preferably turned to correspond with a line drawn from the center ofthe upright shaft b and the axis ofthe rolls, and the lower part of the table has a slope corresponding to that of the rolls, so that as the rolls work over the face of thetable, the parts in contact travel 'at the same speed, and all unnecessary friction is overcome. lThe ends of the shaftscare secured to the yoke a, fitting around the shaft b, and the outer ends of the shafts rest in the bearings or seats c, and as the rolls are raised by the material passing under them, the shafts rise in these bearings, thus preventing injury to any part of the mill in case any material is fed to the pan which is too hard to be crushed when first passing under the rolls. The rolls are journaled loosely on the shafts c, and. are In order to carry the material which is not sufficiently crushed back toward the upper part ofthe table, Scrapers 1' are employed, these Scrapers corresponding in shape to-the slope of the table, and being supported at such height above the table as to allow all material sufficiently crushed` to pass under them, but carry all larger pieces up into the course of the rolls. The rear portions of the scrapers are of such form as to fit closeto the inwardlyextending portion of the annular skirt 71, as at 1, and thus prevent the passage of any insuificiently-crushed material along the skirt. They are bolted to the flange g of the outer rim and are braced by the arms s, extending from the rear of the Scrapers to the said fiange.

The operation of my improved crushing mill is as follows: Power is applied through the bevel-gear d d and vertical shaft b to the annular tapering table B, causing it to travel under the conical rolls C and scrapers r, and as the rolls bear on the table they are rotated thereby, less power being required for this purpose than where the rolls are flat faced, for the reasons before given. rIhe ore, clay, grain, or other materials to be crushed or ground, is fed upon the table at any desired point, and is carried by the rotating table under the rolls or against the serapers,up which it travels, so as to be delivered under the rolls and be crushed thereby. As the material passes under the rolls the rollshafts o rise in their bearings c', allowing any material not crushed sufficiently fine at the iirstcrushing to pass under, and these lumps or large particles are carried by the table against the Scrapers, and by them thrown again to the upper part of the tableinto the course of the u rolls. As the table is rapidly rotated the cenally downward toward its outer edge this slope of the table aids in carrying the material toward the outer edge, so that any material which is crushed fine enough will pass down the table and be thrown by the centrifugal motion through the annular discharge-opening at the base of the cones of the rolls. is then carried, by means of the blades m, through the box j", to the spout Z. The crushed material is not caused to pass up over a rim or annular ridge before being discharged, but is discharged at the lowest part of the table, being thrown against the skirt and through the anular opening after passing un!` der the rolls, and at the base of the cones of the rolls. After the material has passed under the rolls, it is carried round by the table against the Scrapers, and any part not crushed sufficiently line travels up the Scrapers and is thrown by centrifugal force under the rolls and again crushed, while the part crushed sufficientl y passes under the Scrapers, an d is th rown by the centrifugal force through the annular discharge-opening, as above described. The wear on the table comes on the interchangeable wearing-plates e under the course of the rolls, and when they become worn they can be replaced.

To arrange the mill to crush to another gage, the annular skirt is adjusted vertically, as above described, to change the width of the discharge-opening, and if the lower edge of the skirt becomes worn it can be adjusted in the same manner.

rlhe mill may be employed for crushing, breaking, or grinding any desired materials, whether wet or dry, and the table may be arranged to rotate under the rolls, as above described, or the table be stationary and the rolls work over its surface, and in the latter ease, on account of the slope of the table and annular discharge-opening around its edge,an efiieient discharge for the crushed material is obtained. I prefer, however, to have the table travel under the rolls.

That I claim as my invention, and desire to secure by Letters Patent, is-

l. In crushing-mills, the combination, with crushingrolls, of a table or pan, and an annular skirt forming, in connection with the IOO edge of the table, an annular discharge open- GEORGE W. MORROV.

Vitnesses:

'IiIoMAs DONAHUE, THOMAS Hoon. 

